CN219297363U - Ecological treatment system for dredging bottom mud of reservoir - Google Patents
Ecological treatment system for dredging bottom mud of reservoir Download PDFInfo
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- CN219297363U CN219297363U CN202320367798.8U CN202320367798U CN219297363U CN 219297363 U CN219297363 U CN 219297363U CN 202320367798 U CN202320367798 U CN 202320367798U CN 219297363 U CN219297363 U CN 219297363U
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Abstract
The utility model discloses a reservoir dredging sediment ecological treatment system, which comprises a mud control source decrement system, an automatic flocculant supply system, a high-efficiency coagulation system, a conditioning and regulating system, a consolidation and dehydration system and a residual water treatment system which are sequentially arranged; the system is integrated, configured, efficiently utilized, compactly designed and arranged in a modularized manner, and fully utilizes limited occupied land to realize efficient production, is suitable for the ecological treatment engineering of the dredging sediment of the reservoir, and can be widely applied to the sediment treatment fields like deep water reservoirs, lakes and the like. The method not only ensures the slurry inlet concentration of the plate frame, but also overcomes the defect of overlong slurry press filtration dehydration time, and solves the common problems of low and unstable concentration of the reservoir dredging bottom mud slurry, long dehydration time, excessive ammonia nitrogen and pH of residual water treatment and the like.
Description
Technical Field
The utility model relates to the technical field of environmental protection, in particular to an ecological treatment system for dredging bottom mud of a reservoir.
Background
On the one hand, the effective storage capacity of the reservoir is greatly reduced, the service life of the reservoir is shortened, and the benefits of irrigation, flood control, water supply, power generation and the like are further reduced, on the other hand, the reservoir sediment is a source and sink of nitrogen, phosphorus, heavy metals, organic pollutants and the like, and the pollutants input from an external source enter a reservoir water body and finally are accumulated in the sediment, so that when the external environment conditions change, the pollutants are released to the water body through sediment-water interfaces to form secondary pollution. Therefore, the dredging operation is reasonably carried out on the reservoir, so that the reservoir can fully exert functional benefit and prolong service life, and meanwhile, the endogenous pollution of the sediment is restrained, so that the dredging operation is a very necessary operation.
The large amount of mud generated by reservoir dredging has stronger fluidity and larger water content, is easy to spill and leak when directly transported outwards to pollute the environment, and is directly buried, so that not only a large amount of precious land resources are occupied, but also peripheral landslide and debris flow are easy to be caused when the reservoir dredging encounters heavy rain, so that the mud must be dehydrated and reduced, and meanwhile, the residual water generated in the dehydration process must be properly treated and then discharged after reaching standards. The prior art in China mostly adopts direct plate-frame filter pressing after flocculation, but has the defects of long filter pressing time, high water content of filter cakes, low strength and the like, and generally needs to carry out modification and conditioning through a silt conditioner; at present, more alkali conditioning agents are used in China, and although the plate-frame filter pressing efficiency can be obviously improved, the ammonia nitrogen and the pH value of the filter pressing residual water can be obviously improved, and the subsequent residual water treatment difficulty is improved; therefore, how to realize the optimal combination of the flocculant and the conditioner, greatly shorten the filter pressing circulation time and simultaneously ensure the requirement of the residual water treatment system on the water quality of the water, is a great difficulty at present.
Disclosure of Invention
The utility model provides an ecological treatment system for reservoir dredging bottom mud, which effectively solves the common problems of low mud concentration, instability, long dehydration time and the like of reservoir dredging bottom mud.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the ecological treatment system for the dredging bottom mud of the reservoir comprises a mud control source decrement system, an automatic flocculant supply system, a high-efficiency coagulation system, a conditioning and regulating system, a consolidation and dehydration system and a residual water treatment system which are sequentially arranged;
the mud control source reduction system is used for classifying the particle size of the mud material;
the flocculant automatic supply system is used for adding special medicament into the slurry;
the high-efficiency coagulation system is used for mixing the residual slurry screened by the slurry source control decrement system with the prepared medicament, concentrating and precipitating;
the conditioning and regulating system is used for conditioning, homogenizing and homogenizing the slurry treated by the efficient coagulation system, and sending the slurry with the added materials to a tank to be pressed for pressure filtration;
the consolidation dehydration system is used for dehydrating and solidifying the slurry after conditioning;
the residual water treatment system is used for adjusting, reprecipitating and filtering residual water treated by the efficient coagulation system.
As the optimization of the scheme, the mud control source decrement system comprises a pretreatment screening unit and a cyclone screening unit, wherein the pretreatment screening unit is used for screening large-particle-size large-particle gravels, gravels and garbage with the particle size of more than or equal to 5mm, and the cyclone screening unit is used for screening sand materials with the particle size of more than or equal to 74 mu m.
As a preferable mode of the above scheme, the pretreatment screening unit adopts a pre-screening device; the cyclone screening unit adopts a cyclone screening device.
Preferably, the automatic flocculant supply system comprises a plurality of independent medicine storage tanks, a delivery pump connected with the medicine storage tanks, and a PLC connected with the delivery pump.
As the preference of above-mentioned scheme, high-efficient coagulating system is including the first homomixer that sets gradually, multistage swash plate concentrate case, multistage swash plate sedimentation tank.
Preferably, the conditioning and adjusting system comprises a second mixing device and a tank to be pressed.
Preferably, the consolidation and dehydration system comprises a plate and frame filter press.
As the optimization of the scheme, the residual water treatment system comprises a regulating tank, a high-speed sedimentation tank and a denitrification molecular sieve filter which are sequentially arranged.
Due to the structure, the utility model has the beneficial effects that:
1. aiming at the problems that sludge concentration fluctuation caused by large dredging proportion change in the construction process causes influence on the quality and efficiency of back-end sludge water treatment, a multi-stage sedimentation tank and a multi-stage concentration special buffer adjusting system are arranged to stabilize the feeding concentration of a dewatering unit, so that the dewatering efficiency of dredging sludge with large concentration fluctuation is effectively ensured;
2. the special environment-friendly flocculant and the neutral conditioner are used, and the addition mode of the flocculant and the neutral environment-friendly conditioner are added in a combination manner of multi-point addition of the flocculant in a concentration tank, a sedimentation tank, a mud tank to be subjected to filter pressing and the like, so that the concentration of dredging bottom mud and the work efficiency of bottom mud pressure filtration and dehydration are regulated and improved, the alkalinity of residual water is not increased, the pH value and ammonia nitrogen of the residual water are stabilized, and the load and cost of residual water treatment are reduced;
3. the filter-pressing tail water is discharged back to the coagulating sedimentation tank and mixed with the supernatant liquid in the coagulating sedimentation tank, and the water quality and quantity, the total discharge port and the residual water are regulated to be discharged back to the residual water treatment regulating tank and other back discharge procedures, so that the stable operation of the residual water treatment system is ensured, and the standard discharge of the residual water to the raw water warehouse during construction is further ensured;
4. the flocculant and conditioner automatic supply device is applied, and a limited site is fully utilized by adopting modularized arrangement, so that the dredging sediment treatment process flows are tightly connected, and high-efficiency production is realized;
5. the integrated configuration, the efficient utilization of the occupied land, the compact design and the modularized arrangement, the limited occupied land is fully utilized to realize the efficient production, the method is suitable for the ecological treatment engineering of the dredging bottom mud of the reservoir, and the method can be widely applied to the field of dredging bottom mud treatment of deep water reservoirs, lakes and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are required to be used in the description of the embodiments will be briefly described below.
FIG. 1 is a process flow diagram of the present utility model.
Detailed Description
The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, the embodiment provides an ecological treatment system for dredging bottom mud of a reservoir, which comprises a mud control source decrement system 1, an automatic flocculant supply system 2, a high-efficiency coagulation system 3, a conditioning and regulating system 5, a consolidation and dehydration system 6 and a residual water treatment system 4 which are sequentially arranged;
the mud control source reduction system 1 is used for classifying the particle size of the mud material;
the flocculant automatic supply system 2 is used for adding special medicines into the slurry;
the high-efficiency coagulation system 3 is used for mixing, concentrating and precipitating the slurry which is left by the slurry control source decrement system 1 and the prepared medicament;
the conditioning and regulating system 5 is used for conditioning, homogenizing and homogenizing the slurry treated by the efficient coagulation system 3, and sending the slurry with the added materials to a to-be-pressed tank 52 for press filtration;
the consolidation dehydration system 6 is used for dehydrating and solidifying the slurry after conditioning;
the residual water treatment system 4 is used for adjusting, reprecipitating and filtering the residual water treated by the efficient coagulation system 3.
In this embodiment, the mud control source decrement system 1 includes a pretreatment screening unit 11 and a cyclone screening unit 12, the pretreatment screening unit 11 is used for screening large-particle gravel, gravel and garbage with particle size not less than 5mm, the cyclone screening unit 12 is used for screening sand materials with particle size not less than 74 μm, and the rest mud is processed into mud cakes with water content not more than 45% through tempering and high-pressure dehydration. In this embodiment, the pretreatment screening unit 11 employs a pre-screening device; the cyclone screening unit 12 adopts a cyclone screening device.
In this embodiment, the automatic flocculant supply system 2 includes a plurality of independent medicine storage tanks, a transfer pump (a low-shear pump such as a screw pump is used as a transfer pump) connected to the medicine storage tanks, and a PLC connected to the transfer pump. By matching the parameters of the dry powder conveying speed of the medicament, the pumping speed of clear water, the volume of the tank bodies, the pumping speed among the tank bodies, the curing time, the water agent output speed (the system preparation amount) and the like, the continuous and balanced work of the whole process is designed and realized, and the whole system realizes full-automatic operation through a PLC program. Different from the mode that baffle overflow circulation is arranged between the cavities of the existing automatic dosing device, the system uses independent non-communication tank bodies, and by using pumping solution, adverse effects of medium circulation speed between the tank bodies can be eliminated when large-scale preparation quantity design is carried out, independent operation of each step in the true sense of tank body treatment can also be ensured, reaction time is strictly carried out according to design parameters, and the concentration of the produced and prepared medicament is stable and uniform and full. The independent operation room unit can be used as an electric monitoring operation room, a medicament storage and feeding room and a temporary rest room, and the multifunctional integration can enable a plurality of labor operations to be combined, so that the back and forth walking switching of a working room and the cooperation flaws of operators are eliminated, and the manpower resources are saved.
In this embodiment, the efficient coagulation system 3 includes a first mixing device 31, a multi-stage inclined plate concentration tank 32, and a multi-stage inclined plate sedimentation tank 33, which are sequentially arranged.
In this embodiment, the conditioning system 5 includes a second mixing device 51 and a tank 52 to be pressurized.
In this embodiment, the consolidation dewatering system 6 includes a plate and frame filter press 61.
In this embodiment, the residual water treatment system 4 includes a conditioning tank 41, a high-speed sedimentation tank 42, and a denitrification molecular sieve filter 43, which are sequentially arranged.
The working principle of the structure is as follows:
s1, directly conveying sludge to a sludge treatment center through barge transportation or pipelines, and grading the particle size of the materials through a source control and reduction system;
s2, the PLC of the automatic flocculant supply system 2 controls the conveying speed of each conveying pump to convey the medicines to the first uniform mixing device 31;
s3, adopting multistage sedimentation in the coagulation stage, firstly fully mixing the residual slurry after the classification of the source control decrement system with the prepared flocculant in the first uniform mixing device 31, and directly discharging the slurry into the sedimentation tank from the standby pipeline when the concentration tank is blocked or overhauled by the subsequent treatment and the concentration tank is blocked by the concentration tank discharge pipeline through the multistage sloping plate concentration tank 32, wherein the concentration of the slurry is greatly improved when the concentration tank bottom is filled with the concentrated slurry, the supernatant is continuously sedimentated in the multistage sloping plate sedimentation tank and passes through the concentration system, and the concentration of the dredged slurry is greatly improved;
s4, discharging supernatant fluid precipitated by the multistage inclined plate sedimentation tank 33 to the regulating tank 41 through a lifting pump and a filter-pressing draft pipe, pumping and discharging the supernatant fluid to the high-speed sedimentation tank 42, adding a mineral flocculant into residual water, removing suspended matters, suspended phosphorus and dissolved phosphorus in the water, discharging the precipitated sludge back to the filter-pressing treatment, and discharging the impurity-removed residual water to a denitrification molecular sieve filter 43, wherein modified zeolite is filled in the residual water, so that ammonia nitrogen in the water body can be adsorbed, and the residual water is discharged to a river channel at the downstream of a reservoir after reaching the standard after being detected;
s5, adding a proper conditioner into the slurry precipitated by the multistage inclined plate sedimentation tank 33 and the high-speed sedimentation tank 42 through the automatic flocculant supply system 2, wherein the conditioner adopts an environment-friendly neutral conditioner, the flocculant adopts a polyacrylamide flocculant, the polyacrylamide flocculant is conveyed to the second uniform mixing device 51 through conveyor mixing equipment, conditioning, tempering and homogenizing the slurry to be pressed, and meanwhile, according to the specific requirements of the components and treatment of the slurry, if heavy metal pollution exists in the bottom slurry, passivating and complexing heavy metal ions by using a heavy metal ion stabilizer, and then conveying the slurry with the added materials to the tank 52 to be pressed for press filtration;
s6, after conditioning, the slurry is pumped to a consolidation and dehydration system 6 through a slurry pump, and is dehydrated and solidified through a plate-and-frame filter press 61, so that a mud cake is finally formed, and the mud cake is recycled or transported out. Through the combined addition of the environment-friendly flocculant and the conditioner, the time of plate-frame filter pressing is greatly shortened to be within 2 hours to finish one plate, the plate-frame filter pressing efficiency is improved by more than 40%, the water content of mud cakes is less than or equal to 45%, the filtered residual water is slightly alkaline, the pH value meets the standard requirement of 6-9, and the flocculant and the conditioner can be combined in a targeted manner according to different requirements, so that the adaptability and the flexibility are strong. Conditioning the water content, strength and environmental protection of mud cakes generated by filter pressing to reach the standards, and designing a resource utilization scheme according to local requirements in a targeted manner later;
s7, refluxing the dehydrated and solidified filter-press water to a regulating tank 41 at the tail end of the sedimentation tank, regulating the overflow water quality of the sedimentation tank, and improving the overflow stability; meanwhile, if the underutilized flocculation and conditioning materials or the filter cloth plates are damaged in the filter pressing stage, the residual water flocculation and precipitation efficiency can be improved through backflow.
The following will describe the present utility model in detail by way of specific application examples:
11.0.1 it is suitable for ecological dredging engineering of some reservoirs in Chang city. The main construction content is that the ecological dredging of reservoirs and tributary riverways is about 21.52 ten thousand m3 (natural square underwater), the dredging thickness is about 0.1-1.3m, and the dredging area is about 0.95km 2 The mud cake treatment and accumulation amount is about 14.49 ten thousand m 3 The deep treatment capacity of the residual water is about 80 ten thousand m 3 . After being treated, the mud cakes are transported to a preset place for landfill and planting for re-greening, and the residual water is discharged to a reservoir after being treated to meet the requirements of related indexes in the quality standard of surface Water environment (GB 3838-2002) class III standard. Compared with the conventional process technology, the dehydration time can be shortened to within 2 hours, the dehydration efficiency can be improved by more than 40 percent, the residual water treatment cost reduction value is not contained, and the estimated total cost can be saved by about 139 ten thousand yuan.
11.0.2 river channel depth in reservoir area of Yichang cityAnd (3) water environmental protection dredging engineering. The main construction content is riverway dredging, and the total dredging amount is 18.86 ten thousand meters 3 (natural square under water), dredging area about 0.97 square kilometer, wherein: the dry dredging river length is 456m, and the dry dredging square quantity is 0.50 ten thousand m 3 The method comprises the steps of carrying out a first treatment on the surface of the Deep water dredging river length 4767m, dredging square 18.36 ten thousand m 3 The dredging thickness is 0.1-1.5m (the maximum dredging depth is about 52m, the maximum dredging thickness is about 1.5 m), and the mud cake treatment and accumulation amount is about 7.3 ten thousand m 3 After being treated, the mud cakes are transported to a storage yard for landfill and planting for re-greening, and the deep treatment capacity of tail water is about 77.45 ten thousand m 3 . The tail water is discharged to a reservoir after reaching the standard after being treated (the discharge standard of the total phosphorus and ammonia nitrogen pollutants in the dredging tail water adopts class III water standard in surface water environment quality standard GB3838-2002, namely TP is less than or equal to 0.2mg/L, NH3-N is less than or equal to 1.0mg/L, the class III water in the surface has no suspended matter SS standard, and the discharge standard of the suspended matters in the tail water adopts SS is less than or equal to 30mg/L according to the project design file). Compared with the conventional process technology, the single-cycle time of the filter press is shortened from 3.5 hours to 1.6 hours by adopting the reservoir dredging sediment ecological treatment system and the reservoir dredging sediment ecological treatment process, the dewatering efficiency is shortened by more than 50%, and the dewatering efficiency can be improved by more than 50%. The equivalent engineering quantity can be finished, the labor cost is saved by 6.75 ten thousand yuan, the material cost is saved by 24.00 ten thousand yuan, the construction machine use cost is 37.08 ten thousand yuan, the enterprise management cost is 12.60 ten thousand yuan, and the cost is saved by about 80.43 ten thousand yuan.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (8)
1. The utility model provides a reservoir desilting bed mud ecological treatment system which characterized in that: the system comprises a mud control source decrement system, a flocculating agent automatic supply system, a high-efficiency coagulation system, a conditioning and regulating system, a consolidation and dehydration system and a residual water treatment system which are sequentially arranged;
the mud control source reduction system is used for classifying the particle size of the mud material;
the flocculant automatic supply system is used for adding special medicament into the slurry;
the high-efficiency coagulation system is used for mixing the residual slurry screened by the slurry source control decrement system with the prepared medicament, concentrating and precipitating;
the conditioning and regulating system is used for conditioning, homogenizing and homogenizing the slurry treated by the efficient coagulation system, and sending the slurry with the added materials to a tank to be pressed for pressure filtration;
the consolidation dehydration system is used for dehydrating and solidifying the slurry after conditioning;
the residual water treatment system is used for adjusting, reprecipitating and filtering residual water treated by the efficient coagulation system.
2. The reservoir dredging substrate sludge ecological treatment system as claimed in claim 1, wherein: the slurry source control deweighting system comprises a pretreatment screening unit and a cyclone screening unit, wherein the pretreatment screening unit is used for screening large-particle gravel, gravel and garbage with the particle size not less than 5mm, and the cyclone screening unit is used for screening sand materials with the particle size not less than 74 mu m.
3. The reservoir dredging substrate sludge ecological treatment system according to claim 2, wherein: the pretreatment screening unit adopts a pre-screening device; the cyclone screening unit adopts a cyclone screening device.
4. The reservoir dredging substrate sludge ecological treatment system as claimed in claim 1, wherein: the automatic flocculant supply system comprises a plurality of independent medicine storage tanks, a delivery pump connected with the medicine storage tanks and a PLC connected with the delivery pump.
5. The reservoir dredging substrate sludge ecological treatment system as claimed in claim 1, wherein: the efficient coagulation system comprises a first uniform mixing device, a multistage inclined plate concentration box and a multistage inclined plate sedimentation tank which are sequentially arranged.
6. The reservoir dredging substrate sludge ecological treatment system as claimed in claim 1, wherein: the conditioning and adjusting system comprises a second mixing device and a tank to be pressed.
7. The reservoir dredging substrate sludge ecological treatment system as claimed in claim 1, wherein: the consolidation and dehydration system comprises a plate and frame filter press.
8. The reservoir dredging substrate sludge ecological treatment system as claimed in claim 1, wherein: the residual water treatment system comprises an adjusting tank, a high-speed sedimentation tank and a denitrification molecular sieve filter which are sequentially arranged.
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| CN202320367798.8U CN219297363U (en) | 2023-03-02 | 2023-03-02 | Ecological treatment system for dredging bottom mud of reservoir |
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| CN202320367798.8U CN219297363U (en) | 2023-03-02 | 2023-03-02 | Ecological treatment system for dredging bottom mud of reservoir |
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